David w



HEN'DRICKSON 5L MCLEAN.

Furnace for Making Iron N0- fi8,566. Patented Sept; 3, 1867.

WITNESSES.

g aw tartrs ignite: rim,

DAVID W. HENDRIOKSON AND JAMES P. MeLEAN, .OF NEW YORK, N. Y., ASSIGNORS TO DAVID W. HENDRICKSON, OF THE SAME PLACE.

Letters Patent No. 68,566, dated September 3, 1867.

IMPROVED FURNACE FOR MAKING IRON.

TO ALL WHOM IT MAY CONCERN:

Be it known that we, DAVID W. I-Ieumucnso'x and JAM-ES P. McLEAN, of the city, county, and State of New York, have invented certain new and useful improvements in Blast or other Furnaces for Making Iron; and we hereby declare the following to be a full, clear, and exact description thereof, reference being had to the accompanying drawings, which are lettered to correspond with and form a part of the specification.

To enable the public to understand the nature of our'invention, and those who are skilled in the mechanic arts of furnace-building to construct and use the same, we will describe it, as follows, to wit: I

Figure 1 is a perspective vertical section of a blast-furnace.

Letter A is the fire and ore-chamber, which is surmounted by a jacket-boiler, 13, constructed in such a manner thntit forms the tu inel-head D of the furnace, (or a partthercofl) provided with an inclined opening or chute, through which the ore and coal are introduced into the body of the furnace through the boiler. Letters C C are steam-chests, of any suitable shape or dimensions. N N are steam pipes or fines to convey the steam from. the generator to the steam-chests. I P P{ P P P are layers of plaster of Paris mixed with alum, talc, or other non-conducting substance.- The inner layer P" is prepared with alum, which renders it much harder-than the others. E .E is a metallic jacket, which protects the plastic coating from the weather or other lllJ ury.

common use are, first, we require but one fire to generate the steam, operate the engine, produce and keep up the hot blast of any desired pressure by means of the boiler B and its appendages, arranged as shown in the drawings; secondly, by circumscribing the furnace, or the individual parts thereof with a non-conducting substance or substances, wc'are enabled to retaina greater amount of caloric in the furnace with less fuel, labor, time, and expense, and we believe that we produce a more rapid'proccss of smelting, as well as a better article of iron for the use of the forge.

Thereforc, what we claim as new and useful, and what we wish tosceurc by Letters Patent of the United States, is-

1. The vertical flue D through the centre of the boiler, and forming a part of the same, with chute S, which passes transversely through the boiler B at any suitable angle, for the purpose set forth and shown in the drawings.

2. We claim the non-conducting plastic coatings P P P P" P P, prepared and applied in the manner and for the purpose substantially as described. I

In testimony whereof we hereunto subscribe our names in the presence of two witnesses.

DAVID W. HENDRIGKSON.

JAMES P. McLEAN.

Witnesses:

J. D., BLLLnves, A. J. Hermon, Jr.

The advantages of our improved furnace, prepared .as-above set fortln over the ordinary furnaces that are in 

